Gas discharge tube (GDT), as an important protective device, has been developed and employed for the protection of circuit against high-power electromagnetic energy. Accurate description property GDT is critical its practical applications. However, under excitation microwave (HPM), how will respond whether can still exhibit performance remain unclear. Herein, response characteristics to HPM wer...

Objective: The disinfection of dental stone casts using microwave radiation has been shown, but doubts remain regarding its efficacy under various conditions. The aim of the present study was to evaluate the efficacy of microwave disinfection on wet and dry dental stone casts contaminated by a resistant microorganism. Material and methods: In this in vitro study, 34 stone half-casts were prepar...

In this paper, we present a “smart” high-peak power microwave tube, by implementing iterative learning control methodologies to control a repetitively-pulsed, high-power, backward wave oscillator. The learning control algorithm is used to drive the error between the actual output and its desired value to zero. The desired output may be a given power level, a given frequency, or a combination of...

In this paper, we present a novel predistortion method based on Fuzzy Wavelet Neural Networks (FWNN) to linearize the High Power Amplifier (HPA) for WiMAX (Worldwide interoperability for Microwave Access). To analyze and evaluate the proposal, we are considered the model of Traveling Wave Tube Amplifiers (TWTA), both memoryless and with memory. The simulation results show that the proposed sche...

The work presented describes the characteristics of single stage and severed high-efficiency, high-power traveling-wave tube amplifiers operating in X band at 8.76 GHz. Average amplified output powers of 210 MW have been achieved at 24% efficiency. At high output power levels ( > 100 MW) sidebands develop increasing the average radiated power to over 400 MW with a microwave conversion efficienc...

Investigation of a microwave oscillator, synchronized by an invariant external signal has been completed A graphical method has been developed which accurately describes the operation of the locked oscillator The analysis is applied to the Rieke diagram of the tube A report on this work is now in progress It is hoped that this type of analysis may be extended to include more generalized synchro...

We compare the thermal variations of ESR, dc, and microwave resistivity of unoriented bulk single wall carbon nanotube samples. We conclude that the ‘‘metallic’’ high-T behavior (dr/dT. 0! is an intrinsic property of the bulk material, and that the system remains metallic even at low temperature where dr/dT, 0. The spin susceptibility is also independent of T , and a long mean free path implies...

background: poly chlorinated biphenyls (pcbs) are a class of chlorinated organic chemicals that do not easily degrade in the environment. this study was conducted to determine the effect of microwave rays, hydrogen peroxide, dioxide titanium and ethanol solvent on the degradation of pcbs. methods: a 900w domestic mw oven with a fixed frequency of 2450 mhz was used to provide mw irradiation. ray...